diff --git a/rpmbuild/SPECS/omc.spec b/rpmbuild/SPECS/omc.spec
index 10886f0..ef96024 100644
--- a/rpmbuild/SPECS/omc.spec
+++ b/rpmbuild/SPECS/omc.spec
@@ -15,6 +15,7 @@ Group: Applications/Communications
 AGrandTech's 5GC OMC
 
 %prep
+rm -rf ${RPM_BUILD_ROOT}/*
 mkdir -p ${RPM_BUILD_ROOT}
 cd ${RPM_BUILD_ROOT}
 mkdir -p usr/local/omc/